The analytic rule detects the deletion of AWS Network Access Control Lists (ACLs) through monitoring AWS CloudTrail logs. It captures specific events where a user deletes a network ACL entry, which is a critical action since it can nullify access restrictions and potentially expose cloud instances to unauthorized access. By analyzing the event ‘DeleteNetworkAclEntry’, the rule highlights the users involved, the time of the action, and the possible implications regarding security breaches. Such deletions can represent a serious risk, as malicious actors could exploit this to bypass network security measures, facilitating unauthorized access and data breaches. The rule is designed to give security teams insights into these deletions and prompt further investigation if needed.